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Investigation on performance and granulation of Nd-doped Li4SiO4 pellets for thermochemical energy storage
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-12-20 , DOI: 10.1016/j.seppur.2024.131191 Jianchen Yi, Jue Lei, Yuan Wei, Ruicheng Fu, Yingchao Hu
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-12-20 , DOI: 10.1016/j.seppur.2024.131191 Jianchen Yi, Jue Lei, Yuan Wei, Ruicheng Fu, Yingchao Hu
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Lithium orthosilicate (Li4SiO4) is well suited for energy storage systems in concentrated solar power (CSP) generation due to its large energy storage density, and relatively low regeneration temperature. However, performance degradation over multiple storage/release cycles is an urgent problem to be solved prior to its application. In this work, the transition metal Nd was employed as a promoter to modify Li4SiO4 heat carriers, and the results demonstrated that the Li4SiO4 heat carrier doped with 9 wt% Nd2O3 (LA-9Nd) had an energy storage density of up to 680 kJ/kg at 650 °C with almost no attenuation over 10 cycles, which was attributed to the lattice defects and inert frameworks formed by the Nd doping. The energy storage performance of LA-9Nd was also tested under harsh conditions, where high CO2 concentration in the regeneration process deteriorated the carbonation performance of the heat carriers. In addition, to address the elutriation problem of Li4SiO4-based heat carrier powders during cyclic fluidization, water-graphite and agar-graphite granulation methods were used to granulate the LA-9Nd powders. The granulated pellets exhibited both good energy storage density and anti-attrition ability. In general, satisfactory energy storage density, cyclic stability and mechanical performance endow Nd-doped Li4SiO4 heat carrier pellets with great prospects for thermochemical energy storage
更新日期：2024-12-20
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